GitLab

This method calls directly into WebContents::Stop(). Added a test case
for end-to-end verification of browser behavior.

Bug: 852145
Change-Id: Ia1301976542e3b4996579422b98e4d2ae41ea646
Reviewed-on: https://chromium-review.googlesource.com/1185737
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585320}